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並前往https://www.quora.com/Why-does-the-integer-array-in-Java-not-store-null-values-and-instead-initialize-all-values-to-0

Why does the integer array in Java not store null values and ...

It's not about only integer arrays: Try to compile. In Java, int is a primitive type and it is not considered an object. Only objects can have a null value.

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